Final answer:
Increased sodium levels due to high salt intake lead to water retention and increased blood volume, which can cause hypertension. Decreased sodium levels generally result in decreased blood pressure due to a reduction in blood volume.
Step-by-step explanation:
The relationship between electrolytes, water intake, and hypertension revolves primarily around the balance of sodium and other electrolytes in the body. High levels of sodium (Na+), often a result of increased salt intake, can lead to increased blood pressure. When sodium levels are high, the body retains more water to maintain a proper balance of electrolytes, which increases blood volume and pressure. Conversely, decreased Na+ levels would typically lead to decreased blood pressure, as the body retains less water and the blood volume decreases. It should be noted that while moderation in salt intake is commonly advised to control blood pressure, electrolyte and water balance is a complex process influenced by various hormones, such as aldosterone and angiotensin II, which regulate kidney function and blood pressure.